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HOLE IN CONCRETE PLANTER
Hi, I bought 2 concrete planters purely to use as solar water features. I didnt realise or look hard enough to see water would run straight through the "plug hole surround". What would seal concrete and do you suggest I seal the whole interior or just around the join please? Someone mentioned continually holding water might damage the concrete. I had to save up hard for these so I'm hoping they'll stand up to the job! Thank you. 

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“It's still magic even if you know how it's done.”
It's worth bearing in mind that if the sides are straight and water freezes in them during winter it may crack the pots - in much the same way as an outside water pipe can split if it freezes.
Something like a punctured tennis ball floating in it over winter should give enough protection - as the water freezes and expands it will squash the tennis ball and not the sides of your pot.
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.